#include <vector>
#include <iostream>
using namespace std;
class Solution {
public:
	vector<int> findDisappearedNumbers(vector<int>& nums) {
		vector<int> num(nums.size(), 0);
		for (auto&i : nums)
			num[i - 1]++;
		vector<int> ret;
		for(auto i=0;i<num.size();++i)
		{
			if(num[i]==0)
			{
				ret.push_back(i+1);
			}
		}
		return ret;
	}
};

int main()
{
	return 0;
}